[ChromeDriver] Expose CPU Profiling DevTools API into chromeWebDriver

chrome/test/chromedriver/chrome/web_view_impl.cc

Index: chrome/test/chromedriver/chrome/web_view_impl.cc
diff --git a/chrome/test/chromedriver/chrome/web_view_impl.cc b/chrome/test/chromedriver/chrome/web_view_impl.cc
index 052ceb45b8fe886bbe7d2d459ca5a78d468b63da..4403e89bbd10bdd04893480619fe52d247ccfea3 100644
--- a/chrome/test/chromedriver/chrome/web_view_impl.cc
+++ b/chrome/test/chromedriver/chrome/web_view_impl.cc
@@ -421,6 +421,67 @@ Status WebViewImpl::TakeHeapSnapshot(scoped_ptr<base::Value>* snapshot) {
   return heap_snapshot_taker_->TakeSnapshot(snapshot);
 }
 
+Status WebViewImpl::InitProfileInternal() {
+  base::DictionaryValue params;
+
+  // TODO: Remove Debugger.enable after Chrome 36 stable is released.
+  Status status_debug = client_->SendCommand("Debugger.enable", params);
+
+  if (status_debug.IsError())
+    return status_debug;
+
+  Status status_profiler = client_->SendCommand("Profiler.enable", params);
+
+  if (status_profiler.IsError()) {
+    Status status_debugger = client_->SendCommand("Debugger.disable", params);
+    if (status_debugger.IsError())
+      return status_debugger;
+
+    return status_profiler;
+  }
+
+  return Status(kOk);
+}
+
+Status WebViewImpl::StopProfileInternal() {
+  base::DictionaryValue params;
+  Status status_debug = client_->SendCommand("Debugger.disable", params);
+  Status status_profiler = client_->SendCommand("Profiler.disable", params);
+
+  if (status_debug.IsError())
+    return status_debug;
+  else if (status_profiler.IsError())
+    return status_profiler;
+
+  return Status(kOk);
+}
+
+Status WebViewImpl::StartProfile() {
+  Status status_init = InitProfileInternal();
+
+  if (status_init.IsError())
+    return status_init;
+
+  base::DictionaryValue params;
+  return client_->SendCommand("Profiler.start", params);
+}
+
+Status WebViewImpl::EndProfile(scoped_ptr<base::Value>* profile_data) {
+  base::DictionaryValue params;
+  scoped_ptr<base::DictionaryValue> profile_result;
+
+  Status status = client_->SendCommandAndGetResult(
+      "Profiler.stop", params, &profile_result);
+
+  if (status.IsError()) {
+    Status disable_profile_status = StopProfileInternal();
+    return disable_profile_status;
+  }
+
+  *profile_data = profile_result.PassAs<base::Value>();
+  return status;
+}
+
 Status WebViewImpl::CallAsyncFunctionInternal(const std::string& frame,
                                               const std::string& function,
                                               const base::ListValue& args,